Nissan Altima L32. Manual - part 837

HAC-122

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

AIR MIX DOOR MOTOR

Diagnosis Procedure

INFOID:0000000004498272

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

INSPECTION FLOW

1.

 CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial clockwise to maximum heat. 

2. Check for hot air at discharge air outlets.

>> GO TO 2

2.

 CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE

1. Turn the temperature control dial counterclockwise to maximum cold. 

2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?

YES

>> GO TO 4

 NO

>> GO TO 3

3.

 PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to 

HAC-102, "Operational Check"

.

Is the inspection result normal?

YES

>> Refer to 

HAC-155, "Symptom Matrix Chart"

.

NO

>> System OK. 

4.

 CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 5

5.

 CHECK AIR MIX DOOR MOTOR OPERATION

Check and verify air mix door mechanism for smooth operation.
Is the inspection result normal?

YES

>> GO TO 6

NO

>> Repair as necessary.

6.

 CHECK LAN SYSTEM CIRCUIT

Perform diagnostic procedure for the LAN system. Refer to 

HAC-115, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 7

NO

>> Repair as necessary. 

7.

 CHECK AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to 

HAC-122, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 8

NO

>> Repair as necessary.

8.

 RECHECK FOR SYMPTOMS 

Perform a complete operational check and check for any symptoms. Refer to 

HAC-102, "Operational Check"

.

Does another symptom exist?

YES

>> Repair as necessary.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

HAC-123

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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HAC

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SYMPTOM: Discharge air temperature does not change.

Perform diagnosis procedure. Refer to 

HAC-115, "Diagnosis Procedure"

.

HAC-124

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR

Description

INFOID:0000000004498273

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

• Front air control

• Intake door motor (LCU)

System Operation

The intake door control determines the intake door position based on the position of the recirculation switch.

When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and

recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the

opposite direction, again allowing fresh air into the cabin.

COMPONENT DESCRIPTION

Intake Door Motor

The intake door motor (1) is attached to the blower unit. It rotates so

that air is drawn from inlets set by the front air control. Motor rotation

is conveyed to a lever which activates the intake door.

Diagnosis Procedure

INFOID:0000000004498274

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

INSPECTION FLOW

1.

 CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - REC (

)

1. Press the vent mode.(

). 

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INTAKE DOOR MOTOR

HAC-125

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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2. Press REC (

) switch. The REC (

) indicator should illumination.

3. Press REC (

) switch again. The REC (

) indicator should go out.

4. Listen for intake door position change (you should sound change slightly).
Can a symptom be duplicated?

YES

>> GO TO 3

 NO

>> GO TO 2

2.

 PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to 

HAC-102, "Operational Check"

.

Is the inspection result normal?

YES

>> Refer to 

HAC-155, "Symptom Matrix Chart"

.

NO

>> System OK. 

3.

 CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4.

 CHECK INTAKE DOOR MOTOR OPERATION

Check and verify intake door mechanism for smooth operation.
Is the inspection result normal?

YES

>> GO TO 5

NO

>> Repair as necessary.

5.

 CHECK LAN SYSTEM CIRCUIT

Perform diagnostic procedure for the LAN system. Refer to 

HAC-115, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 6

NO

>> Repair as necessary. 

6.

 CHECK AIR MIX DOOR MOTORS PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor. Refer to 

HAC-122, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 7

NO

>> Repair as necessary.

7.

 RECHECK FOR SYMPTOMS 

Perform a complete operational check and check for any symptoms. Refer to 

HAC-102, "Operational Check"

.

Does another symptom exist?

YES

>> Repair as necessary.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR

SYMPTOM: Intake door motor does not operate normally.

Perform diagnosis procedure. Refer to 

HAC-115, "Diagnosis Procedure"

.